Bruins winger Daniel Paille took part in an optional practice at Joe Louis Arena on Wednesday, the off-day between Games 3 and 4 of Boston’s first-round series with the Red Wings.

Paille wore a green no-contact practice. He hasn’t played since April 12 when he suffered an apparent head injury in the penultimate game of the season. He began skating April 19, but hasn’t taken contact.

“He hasn’t been cleared, to my knowledge,” Bruins coach Claude Julien told reporters. “He can skate right now and he’s following protocol.”

With Paille unavailable, Jordan Caron has slid onto the Bruins’ fourth line. Caron scored his first career playoff goal Tuesday in the Bruins’ 3-0 Game 3 victory over Detroit.